Tread portion of an automobile tire



FIG. 1 is a perspective view of a tread portion of an automobile tire according to my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a top view thereof

FIG. 4 is a right side view thereof;

FIG. 5 is a fragmentary enlarged view showing the details of the tread portion thereof; and,

FIG. 6 is a section view taken along line 6-6 in FIG. 5.

Broken lines in the drawing figures are intended to show portions of the tire that are not being claimed, and thus form no part of the claimed design. 

CLAIM The ornamental design for a tread portion of an automobile tire, as shown and described. 